Climatic Seats

WARNING: This page is about a different car, the 2009 Land Rover Range Rover, 2008 Land Rover Range Rover, and 2007 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

High specification vehicles are fitted with climatic seats, which are able to deliver heating and cooling to the front seat occupants. Vehicles fitted with climatic seats feature 2 additional rotary controllers mounted in the instrument panel switch pack, adjacent the clock.

NOTE: If climatic seats are fitted, heated seat switches are not featured on the automatic temperature control (ATC) module control panel.

NOTE: The automatic temperature control (ATC) module does not control any aspect of climatic seat operation.

The controlling software for the climatic seats is contained within a control module mounted below the drivers seat. When a temperature selection is made through either of the rotary controllers, the instrument panel switch pack provides a pulse width modulation (PWM) signal to the control module. The control module interprets the pulse width modulation (PWM) signal as a temperature value and attempts to heat or cool the seat accordingly.

Both climatic front seats contain two Peltier cells; one in the cushion, one in the backrest. The Peltier cells are able to deliver heating and cooling based on a voltage provided by the control module. Each seat also contains a fan, which blows air over the Peltier cells to distribute heating or cooling throughout the seat.

The climatic seat control module monitors seat heating through a negative temperature coefficient (NTC) temperature sensor. The temperature sensor is only used to monitor seat heating. Seat cooling is open loop, with no temperature signal provided back to the control module.

Although the switch light emitting diode (LED)'s will illuminate if a selection is made when the ignition is switched on, the Peltier cells will not operate until the engine is running. After the ignition has been switched off, the control module will remember the current temperature settings for approximately 15 minutes. After this period, the seats will be set to 'off' when the ignition is switched back on.